Astronomers have found strong evidence that old stars like the Sun are swallowing nearby planets. This key finding provides important insight into the forces that shape planetary systems as stars evolve from the main sequence.
According to RCO News Agency, As stars like the Sun run out of hydrogen, they begin to expand and cool, becoming so-called “red giants.” For the Sun, this dramatic change is predicted to occur in about five billion years.
Scientists believe that this expansion could destroy the planets Mercury, Venus, and possibly Earth, but so far there is little direct evidence to confirm exactly how or if this could happen.
Now a study led by researchers from the University of Warwick and University College London has shed new light on the fate of planets orbiting old stars. By analyzing nearly half a million nearby star systems, the team sought to understand how long planets survive when their host stars become red giants.
Their findings show that planets are much less common around stars at this late stage of their host star’s life, suggesting that many of these nearby planets are likely destroyed by the expansion of their stars, and providing strong observational evidence of this dramatic planetary death.
According to Edward Bryant, lead author of the study and Warwick Astrophysics Award Fellow at the University of Warwick, who carried out much of the research at UCL’s Mullard Space Science Laboratory, the findings provide strong evidence that as stars evolve from the main sequence, they can rapidly cause nearby planets to spiral inward and annihilate.
This phenomenon has long been debated in theory, but now its effect can be directly observed among a large population of stars. As Bryant explains, old stars can effectively swallow up nearby planets because of a gravitational pull called “tidal interaction.” As the star expands, the planet’s pull on the star slows its orbit, causing it to spiral inward until it either collapses or is absorbed.
The team focused on stars that had recently entered the post-main sequence phase and had run out of hydrogen, and identified only 130 planets and planet candidates orbiting them, 33 of which had not been identified before.
Focusing on stars that have cooled and turned into red giants, the researchers found that the probability of such a star hosting a nearby planet is only 0.11 percent, about three times less than the probability of a giant planet in close orbit for a main sequence star.
That being said, planet Earth may survive the red giant stage of the Sun, but it probably won’t have life on it.
Within a few billion years, the Sun will become a red giant, researchers explain, raising questions about the fate of the solar system’s planets. Their study suggests that while some planets are destroyed in the early stages after the main sequence, Earth is likely safer than the nearby giant planets studied.
However, although the planet itself may survive, as the Sun continues to evolve, the conditions for life will almost certainly disappear.
Although the study shows that giant planet formation slows down as stars age, the few planets that remain in close orbits around red giants provide valuable insights.
Bryant also notes that determining the mass of these planets will help researchers understand the forces that cause them to spiral inward and eventually destroy them, providing a clearer picture of the processes that shape the fate of planets orbiting old stars.
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